* {
  margin: 0;
  padding: 0;
}

.back {
  width: 100%;
  height: 100%;
  background: url(../assets/img/login.png) no-repeat;
  background-size: 100% 100%;
  background-attachment: fixed;
}

.a {
  background-color: rgb(255, 255, 255);
  opacity: 0.7;
  /*阴影（正值，正X向右，正Y向下，颜色）*/
  box-shadow: 10px 25px 25px rgb(171, 171, 168);
  width: 400px;
  height: 350px;
}

h3 {
  text-align: center;
  font-size: 40px;
  padding-top: 20px;
  color: #ff0062;
  font-weight: bold;
}

.but {
  border: 2px solid #ff0059;
  padding: 6px 20px;
  border-radius: 10px;
  font-size: 15px;
}

.but:hover {
  background-color: #ff0059;
  color: rgb(255, 255, 255);
}

span {
  color: #3b3b3b;
  font-size: 20px;
}

input {
  border: 2px solid #616161;
  border-radius: 5px;
  width: 200px;
  height: 30px;
}

.buttom {
  text-align: center;
}

.text {
  margin-top: 30px;
  text-align: center;
}